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A159407 Number of n X n arrays of squares of integers summing to 21. 1

%I #10 Dec 22 2023 12:42:54

%S 28,7182,3923136,2168352600,1094602264164,437181997913808,

%T 123598365410489088,22732655012770729752,2620728473996336526900,

%U 193309311936589609598244,9610726322148658419480768,340892034159072851206852178,9072999131907316862007475724

%N Number of n X n arrays of squares of integers summing to 21.

%C All such sequences have holonomic recurrences (cf. comment in A159359). - _Georg Fischer_, Feb 17 2022

%H R. H. Hardin, <a href="/A159407/b159407.txt">Table of n, a(n) for n = 2..100</a>

%H Vaclav Kotesovec, <a href="/A159407/a159407.txt">G.f. for A159407</a>

%H <a href="/index/Rec#order_43">Index entries for linear recurrences with constant coefficients</a>, signature (43, -903, 12341, -123410, 962598, -6096454, 32224114, -145008513, 563921995, -1917334783, 5752004349, -15338678264, 36576848168, -78378960360, 151532656696, -265182149218, 421171648758, -608359048206, 800472431850, -960566918220, 1052049481860, -1052049481860, 960566918220, -800472431850, 608359048206, -421171648758, 265182149218, -151532656696, 78378960360, -36576848168, 15338678264, -5752004349, 1917334783, -563921995, 145008513, -32224114, 6096454, -962598, 123410, -12341, 903, -43, 1).

%F G.f.: see link above. - _Vaclav Kotesovec_, Dec 04 2012

%K nonn

%O 2,1

%A _R. H. Hardin_, Apr 11 2009

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)